| Regimental number | 4599 |
| Place of birth | Balmain, New South Wales |
| Other Names | Harold Lionell |
| School | Darling Road Public School, Balmain, New South Wales |
| Other training | Secondary School |
| Religion | Church of England |
| Occupation | Clerk |
| Address | 460 Darling Street, Balmain, New South Wales |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, H M Allen, 460 Darling Street, Balmain, New South Wales |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 18th Battalion, 11th Reinforcement |
| AWM Embarkation Roll number | 23/35/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A71 Nestor on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 18th Battalion |
| Fate | Died of wounds |
| Place of death or wounding | Bullecourt, France |
| Age at death | 19 |
| Place of burial | Grevillers British Cemetery (Plot II, Row C, Grave 6), France |
| Panel number, Roll of Honour, Australian War Memorial | 84 |
| Miscellaneous information from cemetery records | Parents: Henry Melville and Harriett ALLEN. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |